Mark the tick against the correct answer in the following:

Question:

Mark the tick against the correct answer in the following:

$\left|\begin{array}{ccc}a^{2}+2 a & 2 a+1 & 1 \\ 2 a+1 & a+2 & 1 \\ 3 & 3 & 1\end{array}\right|=?$

A. $(a-1)$

B. $(a-1)^{2}$

C. $(a-1)^{3}$

D. none of these

Solution:

$\Rightarrow(\mathrm{a}-1)^{3}$

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